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| author | inmarket <andrewh@inmarket.com.au> | 2013-10-25 14:39:56 +1000 |
|---|---|---|
| committer | inmarket <andrewh@inmarket.com.au> | 2013-10-25 14:39:56 +1000 |
| commit | e0b2406da613b02fce6af8aead160e43301a3852 (patch) | |
| tree | ad1b9368ac9ac6080bca13358ef45bc985778323 /drivers/gdisp/SSD1306/gdisp_lld.c | |
| parent | 7a7e223d152b42553f7e6ce0220dd5d736b89c56 (diff) | |
| download | uGFX-e0b2406da613b02fce6af8aead160e43301a3852.tar.gz uGFX-e0b2406da613b02fce6af8aead160e43301a3852.tar.bz2 uGFX-e0b2406da613b02fce6af8aead160e43301a3852.zip | |
Fix SSD1306 driver and board files to allow for seamless transfer of the command byte with the page line data without copying the data on to the stack.
Diffstat (limited to 'drivers/gdisp/SSD1306/gdisp_lld.c')
| -rw-r--r-- | drivers/gdisp/SSD1306/gdisp_lld.c | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/drivers/gdisp/SSD1306/gdisp_lld.c b/drivers/gdisp/SSD1306/gdisp_lld.c index 81b3b692..390a9282 100644 --- a/drivers/gdisp/SSD1306/gdisp_lld.c +++ b/drivers/gdisp/SSD1306/gdisp_lld.c @@ -36,6 +36,13 @@ #ifndef GDISP_INITIAL_BACKLIGHT
#define GDISP_INITIAL_BACKLIGHT 100
#endif
+#ifdef SSD1306_PAGE_PREFIX
+ #define SSD1306_PAGE_WIDTH (GDISP_SCREEN_WIDTH+1)
+ #define SSD1306_PAGE_OFFSET 1
+#else
+ #define SSD1306_PAGE_WIDTH GDISP_SCREEN_WIDTH
+ #define SSD1306_PAGE_OFFSET 0
+#endif
#define GDISP_FLG_NEEDFLUSH (GDISP_FLG_DRIVER<<0)
@@ -54,7 +61,7 @@ #define delay(us) gfxSleepMicroseconds(us)
#define delayms(ms) gfxSleepMilliseconds(ms)
-#define xyaddr(x, y) ((x) + ((y)>>3)*GDISP_SCREEN_WIDTH)
+#define xyaddr(x, y) (SSD1306_PAGE_OFFSET + (x) + ((y)>>3)*SSD1306_PAGE_WIDTH)
#define xybit(y) (1<<((y)&7))
/*===========================================================================*/
@@ -70,7 +77,18 @@ LLDSPEC bool_t gdisp_lld_init(GDisplay *g) {
// The private area is the display surface.
- g->priv = gfxAlloc(GDISP_SCREEN_HEIGHT * GDISP_SCREEN_WIDTH / 8);
+ g->priv = gfxAlloc(GDISP_SCREEN_HEIGHT/8 * SSD1306_PAGE_WIDTH);
+
+ // Fill in the prefix command byte on each page line of the display buffer
+ // We can do it during initialisation as this byte is never overwritten.
+ #ifdef SSD1306_PAGE_PREFIX
+ {
+ unsigned i;
+
+ for(i=0; i < GDISP_SCREEN_HEIGHT/8 * SSD1306_PAGE_WIDTH; i+=SSD1306_PAGE_WIDTH)
+ RAM(g)[i] = SSD1306_PAGE_PREFIX;
+ }
+ #endif
// Initialise the board interface
init_board(g);
@@ -131,8 +149,8 @@ LLDSPEC bool_t gdisp_lld_init(GDisplay *g) { write_cmd(g, SSD1306_SETSTARTLINE | 0);
- for(i=0; i < GDISP_SCREEN_WIDTH * GDISP_SCREEN_HEIGHT/8; i+=GDISP_BUS_MAX_TRANSFER_SIZE)
- write_data(g, RAM(g)+i, GDISP_BUS_MAX_TRANSFER_SIZE);
+ for(i=0; i < GDISP_SCREEN_HEIGHT/8 * SSD1306_PAGE_WIDTH; i+=SSD1306_PAGE_WIDTH)
+ write_data(g, RAM(g)+i, SSD1306_PAGE_WIDTH);
}
#endif
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